diff options
Diffstat (limited to 'nuttx/fs/fs_open.c')
-rw-r--r-- | nuttx/fs/fs_open.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/nuttx/fs/fs_open.c b/nuttx/fs/fs_open.c new file mode 100644 index 0000000000..deedd60feb --- /dev/null +++ b/nuttx/fs/fs_open.c @@ -0,0 +1,167 @@ +/************************************************************ + * fs_open.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name Gregory Nutt nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************/ + +/************************************************************ + * Compilation Switches + ************************************************************/ + +/************************************************************ + * Included Files + ************************************************************/ + +#include <nuttx/config.h> + +#if CONFIG_NFILE_DESCRIPTORS >0 + +#include <sys/types.h> + +#include <stdio.h> +#include <sched.h> +#include <errno.h> + +#ifdef CONFIG_FILE_MODE +#include <stdarg.h> +#endif + +#include <nuttx/fs.h> +#include <errno.h> + +#include "fs_internal.h" + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +int inode_checkflags(struct inode *inode, int oflags) +{ + if (((oflags & O_RDOK) != 0 && !inode->i_ops->read) || + ((oflags & O_WROK) != 0 && !inode->i_ops->write)) + { + *get_errno_ptr() = EACCES; + return ERROR; + } + else + { + return OK; + } +} + +int open(const char *path, int oflags, ...) +{ + struct filelist *list; + struct inode *inode; + int status; + int fd; + + /* Get the thread-specific file list */ + + list = sched_getfiles(); + if (!list) + { + *get_errno_ptr() = EMFILE; + return ERROR; + } + +#ifdef CONFIG_FILE_MODE +# warning "File creation not implemented" + mode_t mode = 0; + + /* If the file is opened for creation, then get the mode bits */ + + if (oflags & (O_WRONLY|O_CREAT) != 0) + { + va_list ap; + va_start(ap, oflags); + mode = va_arg(ap, mode_t); + va_end(ap); + } +#endif + + /* Get an inode for this file */ + + inode = inode_find(path); + if (!inode) + { + /* "O_CREAT is not set and the named file does not exist. Or, + * a directory component in pathname does not exist or is a + * dangling symbolic link. + */ + + *get_errno_ptr() = ENOENT; + return ERROR; + } + + /* Make sure that the inode supports the requested access */ + + if (inode_checkflags(inode, oflags) != OK) + { + inode_release(inode); + return ERROR; + } + + /* Associate the inode with a file structure */ + + fd = files_allocate(inode, oflags, 0); + if (fd < 0) + { + inode_release(inode); + *get_errno_ptr() = EMFILE; + return ERROR; + } + + /* Perform the driver open operation */ + + status = OK; + if (inode->i_ops && inode->i_ops->open) + { + status = inode->i_ops->open(&list->fl_files[fd]); + } + + if (status != OK || !inode->i_ops) + { + files_release(fd); + inode_release(inode); + *get_errno_ptr() = ENODEV; + return ERROR; + } + + return fd; +} + +#endif /* CONFIG_NFILE_DESCRIPTORS */ |